6.33.7 Blackfin Function Attributes

These function attributes are supported by the Blackfin back end:

exception_handler

Use this attribute on the Blackfin to indicate that the specified function
is an exception handler. The compiler generates function entry and
exit sequences suitable for use in an exception handler when this
attribute is present.

interrupt_handler

Use this attribute to
indicate that the specified function is an interrupt handler. The compiler
generates function entry and exit sequences suitable for use in an
interrupt handler when this attribute is present.

kspisusp

When used together with interrupt_handler, exception_handler
or nmi_handler, code is generated to load the stack pointer
from the USP register in the function prologue.

l1_text

This attribute specifies a function to be placed into L1 Instruction
SRAM. The function is put into a specific section named .l1.text.
With -mfdpic, function calls with a such function as the callee
or caller uses inlined PLT.

l2

This attribute specifies a function to be placed into L2
SRAM. The function is put into a specific section named
.l2.text. With -mfdpic, callers of such functions use
an inlined PLT.

longcall

shortcall

The longcall attribute
indicates that the function might be far away from the call site and
require a different (more expensive) calling sequence. The
shortcall attribute indicates that the function is always close
enough for the shorter calling sequence to be used. These attributes
override the -mlongcall switch.

nesting

Use this attribute together with interrupt_handler,
exception_handler or nmi_handler to indicate that the function
entry code should enable nested interrupts or exceptions.

nmi_handler

Use this attribute on the Blackfin to indicate that the specified function
is an NMI handler. The compiler generates function entry and
exit sequences suitable for use in an NMI handler when this
attribute is present.

saveall

Use this attribute to indicate that
all registers except the stack pointer should be saved in the prologue
regardless of whether they are used or not.